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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c27d67f7f964717c7ee52dd919bbe5e61fa7adc13df61c97327c983a7a6f11' 
  AND token = 'R2TmacDg9JT7nwBd92A0FYZ2M5K3b+48yYigXMQMmPo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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