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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a329a0c92421e4baed1e7f6a797f3308ae44779e91f45e977901510f9ef59629' 
  AND token = 'oSw0E0EOBIJgKJqcXuTStpa/FN0HNMxCexrP+sLSOEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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