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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d90ef722928f9233f773af7d88da6caa68b931d7e3fa19e1b0e54c1591e0c1a' 
  AND token = 'lPao63HkS+p9IO4sm77GX4bWG6O6pKZ+1h2JAliipQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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