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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298d4feb7f421699bf52d328784cce67bca326115ac5216241cb4d4b0f3bc70c' 
  AND token = 'yq8vpebx9WRgDIdh/TiMKRuxX3uyOs6ObWxBMVeDr0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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