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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '369a7aa4787be16d9db8176330fe7482c738e716572132f69996e91501c07661' 
  AND token = 'I6SLTwbr2FbNJzk71kp5E3RIZavj8UJ/nEQyUJyGC/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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