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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5777b9b27ed101bfde75c7ecc5ee83cbd510cda17d7a0d6d75798dfd85159b75' 
  AND token = 'cnsz/JkuZLblJRL3KWKq631mzYA2VOVIqMlfb3PRWE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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