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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbd2cebe66d369532511496988d28a1a06ad8b1860f595f999a6f04cf8c64b0b' 
  AND token = 'iwET94C5Jje55OKjBrprusvp1KzQ2fQKzmCC++Xwn8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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