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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e8612cc0a20c9f631db0a34ade61fe7b27fdd2ca660945ccfaa284c047a774' 
  AND token = 'oUM8M5mz/rcyCSRsl+obJGTTBuq3gP4E2CCqRthseNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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