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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2db4f18af4882af7de338bd022001e5c4442f461003ec998d13a37b6d18396da' 
  AND token = 'NUhT3EnHVA1lEBY24Hmuz78c29990ze+G3eu9x253B8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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