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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6cd689817eedb170a6b3e137ed3bb869284815b827c7d72fc8caa4ceb87a472' 
  AND token = 'ec89k5bQ3wFGpM7EQSXUZq2DBEUSaVFmqIf96+peOWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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