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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28fa6014c1e5615bb914dc69e0b099ff26edf6dc00ee41dd2031d44bb127b5d9' 
  AND token = 'aepVke5ybR5bZOOh4/VE+Y32k3UhAGO98pUMB6fdYRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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