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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7db7cdc5d6a33c53e266b83bf73a3f8baf1d32db013acd74c1c634b992f7623f' 
  AND token = 'wcDETGNv2ka9qQD0jo6x4QJYrPDQgyIs5lJV1inkxqY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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