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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd82ae7cb744b963717cb323d66f1c20ba6f47629c8bb0e1741801b1b6b373adf' 
  AND token = '/Hll/K+v+7ZnlEaLHimUaqetKTcjzToxfcB9tuD7uXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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