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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58f904742d232ebf657350e21022d6419c24a85c2b85fa5bc3212f3682523f75' 
  AND token = 'pje9dKuAr6gRI4kUiTVBQuFa6TL3AE7OXytgY1N8MFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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