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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79dff29e763e4e08d309f60892696f19000c5ab9cc4c4e2d5c7f0536616988e4' 
  AND token = 'Wfgf+mS/HqTg4PrMle7gYLErjLwbly3ttIt1HFc/vKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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