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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6c3fa6dd9ad49079570cd861ad13ce7cc2702e8c50e9565499dd24e92b5576' 
  AND token = 'g2koLxy3LYtsgWfC0yHDrb7XdpcwKP0nGtmM5Yu1alg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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