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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e2b8d2b9e5def43142db2bc425cfdd70e39c327483c5557cdbc34a6036946c' 
  AND token = 'GzFkoA/8+7QVyw0dkdHWhJBLtO4AsGGbWaHkXxn6aOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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