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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbe2d4f2992503a97959929d9aa893a0d97b0922bf5f6bda86282dc00c3e4431' 
  AND token = 'l9Kg5PtZ65IzrrIGSnbxN/ogjwowu9P6VMonvgFB91A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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