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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf226f05c79e15e562dda21cf44aed87e6ba6d618d9c46b38fdf943ca93b5801' 
  AND token = 'I9khdV/FLeQFm6c10gxJZqPK41eDctb8hyGPYdYOzhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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