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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cef24b148bb2cc969fa2448a7003401ecfe0b50d1c16caf0c4336625e076a34' 
  AND token = 'UIejsOYD8gB4x6QYM3apqQTRO6quhzzvBetOlZgSu50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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