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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ade173866992d41b17c480b7a97902ab9e6cbf166a41974a34637a7c1cc89cad' 
  AND token = 'G7yi41weJt6p11pvtQVzPfbiAY3COGWJKTL429kNgQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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