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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ce0dbcf95c8526f9bdda6d20fd5d4e475d48c0d22dbda718683aa403c7c7af5' 
  AND token = 'jao7cAYYw1Cwlh5y36Ri6jcDncc1+1+AZLn2M8euDwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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