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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b41964e2181d9d88294d0d7f82db6507bca26573de69d5a1f9a41fbd0e837c2e' 
  AND token = 'm60sSlLNDL3AOtsKmdjFI+i7VnBkVMMWajtwWn+zE1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}