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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9b5910335f4cab0a02b6de3e695a6329d76af067b595b81a8f10d8a68256a2d' 
  AND token = 'SP4gEx8AE+lOl5UO+dw36846WPkHZHR7RVI9dss6Usw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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