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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a51e088a271a6bf1ecc8adfcac8d559642ec564da72095086d9260df4a38945' 
  AND token = 'WsAE9qIj1QCltdLq0XGiJ2PiTQcIQP4fL0dr6R40/w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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