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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68331fac1915aa7e0e6c1c6ddffe95474006162bb925d82229e1776d5c5696dc' 
  AND token = 'Qh1stlw4d2vAb6ntRVNpBAjnhHPr9Ur7jpuMc98VjTI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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