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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2bcc2ccb9dfca870d6db996b38bb0a0eea4a96ee04ee2bfb57005ea3721a320' 
  AND token = 'Dr2V2DgOJNzO8NlSumm6pUOXg9AHX8U3bzZ7D81xudc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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