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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e88733c75716a0d61e9d57d0c5a483c5d11bb7e3b08fe51ca4d50071a485e31' 
  AND token = 'm4QPnHZkIML/lopNy74M9AganQh7sroZUYMhbTpX8Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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