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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab62f7d5afd2d94d9ce623e6d41eee1d5291d5cc0a6abddeefde2676de52a46e' 
  AND token = 'zbyQ0v6LYF1iwsjILEp1HAq0iEBEcRWJ984WVY8p24Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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