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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f2b60f76e4328097c93f26cc4f799a88e417394b49fcabd92b9b77b67cfe617' 
  AND token = 'H2jHFQ/GqHt94+iprwD2YlD2Vo0mF9SWGOUQKmYRlZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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