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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7eef0a766aa1b79265c4e3d8ec80bd3c6a9ad2ae5e3dba41ca9d37273dba1f49' 
  AND token = 'PU4FWDlG2YxgWNJBPOE0kblu3hCI+NNo69XFshBZ5YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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