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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e6acb9ac89d1daa1c93113d91386b7c6cc0b786df8e28dd84d5c09f3eef8273' 
  AND token = 'J/NGdXEjCl/LQFDCHv4ej8+lhjUpJSs/XJMRvRnDwrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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