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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '826e6cc240c558ed1bc16207aecb26b4df64a8fcc94a99d41cc1b6774653cc09' 
  AND token = 'jB0o155gdQmWORPmSWV6WJCyMjpebIyP3bUoFRijgHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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