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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4c7fadf8ce6ce05d7b08fdf39d871e362ac8843c7d75075b86d265ea1d09490' 
  AND token = '+yWO9OBnmcFIVT2/6Rv5uxSysYJrxHZJocs1PYER7+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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