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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8453618dc429c0394af21060c74fe7f2b8d91d8e88c82fcb367bd483ea4f64f' 
  AND token = 'GoSrckI3qCriLVxaZGQQcG2egdsCb7LqNJs50qh90KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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