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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43c6b8127f68863d911f1f9f8b8178fff4ffba912c9174d6bcbb84a2932a7927' 
  AND token = 'ICEM9q3hVj6jIQziyulw8CxN+qngAIBbxb9uoO9fkIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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