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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528335ac4c4a83d384c1f737c99ff0481a5a15efcb298c9aae3d9b1faaf8af9b' 
  AND token = 'dKWouRySJtriv6udyOUbOOUEkuGwHbqy6afg7RVEby0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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