SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f999432b7043bc1ed86f536006b553c114de974fc0b03328339fe269b955f37' 
  AND token = 'zArqPzMu2dG5h1HDOp+sW6wBFzetxQ0juYSsH/wtHwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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