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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e1d74af7c9f99c93e769d95d3368e22dc5d9a666ee3d156041226e558a968af' 
  AND token = 'zYmNlVlQslgG5tKyjLDXess5XUS73oWmczA9i7GCNmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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