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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7fa72e2c67702940f0ad0deb7f399e461a837e0135ee2effd93598b19dee6ad' 
  AND token = 'bYqkKPWvipMd8DCS2US4rDImxkpaZOJiE4TNnDFx1mg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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