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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ee9b88665f66376185c4e80ec9ef9e9384917920f7652f0584adce672a0fc37' 
  AND token = '0pue84pz+DStP27S9NTBf5Z6lvVYanML6uNZWa6ixuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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