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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1b4b40f8a2101515b42b90d35bebb2b8d6f190b901b014004f22d38a5766b35' 
  AND token = 'dxv3jnyypojXKloeih6Kcf/MFiLGOOM/FBmI4w9yVCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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