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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11277f80029a0b5fa9d162ef3298b313f02e3812fa75f87d8ae631492ad9b2e1' 
  AND token = 'utWyEqh8MHf/xg/vkPg6o16wITAnQdd4+79UscZXJJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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