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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ae909f360401511cd91016e5bf4852ca90e91a79fbe9d31c1dc9647238e788' 
  AND token = 'QXFY3NwL9UxG5uQJUJsx7g1rUYIyQtRFJxrYrliqWCQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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