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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b153b13f7ef215ad8a22a8d8302128b250fe45a2e190c32d597465dacdf8a25' 
  AND token = '/A0vkn2rDxP5I96C0rT6Hh7JGHu7PDcJqbZmv11n6PE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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