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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e0f7d1a3d7dc028e11c391c3925c9354e22d9fed2e97b29a67676b583160a9' 
  AND token = '8zFU8bv/NyaaAwXMw3YHHnVHlowGGme5Nak55CS8MW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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