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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0537d769f67dd6da23673c7b19eb641cbdeff5a17eaad1fb75a5e28e37022055' 
  AND token = 'Qnf8X0nV5SNHGqNsH7yyuRd9EtIC9lckmUbyWibQUPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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