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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88aaeac109b9ddc4a67be3f2a751ac87c71cbf70c738c001b41a88c1951c4388' 
  AND token = '2hF8VnJa/FcjDwx+WkQ6eUFnc/JQV3RaajLFARkEhcc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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