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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e73066a4bfa040b82d387de4b5e2ea5d549f96d8706521a7feb2b01f7252e9a' 
  AND token = 'nj/Q2J6M9LsZO9yhlM7UfT83dC4ecori+Q034FxVvdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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