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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eda9a14f718ec6eef04927942d69b89ece1fb5a0d6923ca71d2b28753b7d2556' 
  AND token = 'mfmBI7ixGQWWSm9ZO0X0wiv7YTH0zG7KcTL0dlut3Ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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