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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2e296dfd03821d6e6313292591933aa9c4aeae1530f3fc84890aa7f36e443ad' 
  AND token = 'RkWsirfh8Xbk0rcSRMT0nsdvxgDyhkjlJpxg0vKYgYM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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