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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19e4ad63edbb61b683e098e580090ccc21998a8788fc1db10b51f19cc6781907' 
  AND token = '6HzoJpsiCKpAHHAv1zcpblV1JshB2N4IEOdgpwldguU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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