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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d6a15ef4926b808807d13e610d44cd494eb68589aeff9e8e96cf21d7d2978a1' 
  AND token = 'chJKIKAQa+Uu6gpVKiyE/ztNtNrT6i9b+xw52TzmPi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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