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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b6ae748eebd7dac726dac3bd7a96adc825a9e32c2301880f9fffcc3a8a49db' 
  AND token = 'Ufm/+03ZhwvJRbouCEw8wmk4MqYh+o+QpU52o8R7ekY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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