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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06dfecb28ea07cb701ed9cd4b147f7e6588356d705a18f304064e6cf46fe5ad4' 
  AND token = 'U6sf1b/DagMQta81jA26wR3f7em4SLPUj0pMYrmCOZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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