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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86a9a8769e101e5c481da804ed778e1214a5adf7d2d4d11ff0cee4a34aadb87d' 
  AND token = 'hQIIh6Tp/3dTSS753JgVSAUvJ0rbur1nI4uPMQZayOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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