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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4703528807b4f7b96aa4af7f48d6fcc4d02530dbeb96dd3bad695b714af55d9a' 
  AND token = 'v9bt36eET7lqqyVfybJSNN2sbXbWvfvTSfnIWTz5GKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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