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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dbc58db3871f8e08d8cc23f9f8c0e35c0030efc79554ba08d9e019e9deef9aca' 
  AND token = 'a9UOQLT0tCfMKQBGtJZvKS92TKG69ie66cVbmnVSsVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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