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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1709998562b34cab06e0a8770fa37c28f9b99dc3563f01d613ab07efee324c35' 
  AND token = 'Oe0vZztWh/6vKRWYnNkbUS/z1AqebYyC3x8ghdrV6wM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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