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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c879375ff69899cdac07a7135bdb237bdd25d8d1af845e5eb055d9e31eb66d40' 
  AND token = 'EE5mqltGieRgqcQiCTksA5P/5pjQ1BdZNnnOeLWAQUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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