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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dfde68afb2fa73bfa80de5e30fd7439222ea12b82d1f10861f3b91077f62673' 
  AND token = '9pruq4aS10mu0VIai2BBK6W0Pbu8XwxsYuI5WHGbVcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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