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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be3fd3fd7b8c9cf784262899d899be78009b79652bdd4129f72601c1323fdbd1' 
  AND token = 'GtnLT32ehQPaZGx0D8BvZ7KF4F1Sv27/dxHza1VLgTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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