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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd182b3837f2fbe0d17220067e2bc7f192456be8d17b72bdb462d9f98a781a4f2' 
  AND token = '6WrbalA1qZSkmqkRODiXUbFsw7k9OAA8SY46ykq3RSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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