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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff1b922f0b44c3efb3cf9e2b381f89924c1792762cd8b8eaaf7e75e35193fb3f' 
  AND token = 'pjV4fk+cu1m/zBBy9EtpZfiUWA9j4ukzl2y1Ol1PB10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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