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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea46f0fe90073bdc7df3dae3215073ed487124770d4be24d76f96c1394145e65' 
  AND token = 'l2Nyiqvy0JweJ6le9/S4TRjoYI2yPEMB6pbCHKRcKaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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