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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0da8bf00b7c99af5ddde8a54f823d6930db59910649b3213dc292a977f8dad73' 
  AND token = '1hVrhW6cfGIMivX1M2qu/Xr1t//zAGrg6ANeM4hWL8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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