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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34cfa98736294a110ceed2d9707523685f9b0a454480d846fe11496891ce8e87' 
  AND token = 'B6NoWrr3flwLKbKNkIjjfqYK6WL7bKxmCa3Szs23LvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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