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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54c4ccec6a9fc6ca538329ce4f969d6500ce223a2081f016e71572eeb1cc7550' 
  AND token = '9hJDXie5V9kcIu0kuGk07ZWCqeHm6fXNzwT1AX4BM+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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