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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48a1194539f7e19a44c87ff8b6a1b9bc182ef19ef47d08c8e2ad7c5efb8bc4ba' 
  AND token = 'Rxt8KtcsyE6dj7+tMaoeU6qn7LiJCTrAz+nnhxVtV5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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