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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '259828221e4f90044908f0703e6514fc5a1df10556ff9ba8e70c5cceae251b35' 
  AND token = 'jgYFBoeCVGgajWyWsLl1gQ4xansmMAGCJLbP8/IWY5M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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