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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30723e5fe4c197de8d8156a8e3624d1f41a34783d72c118505826ba19fbc4751' 
  AND token = 'jTjgrveOfr/8DlscW9rFyG5aPSVPec13vHaAkMfAlIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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