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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '180b98671192ef3cd592fb83b36c15f2e0b8a23dc56e06af8bdb07b0cc90d217' 
  AND token = '89zP+aYBWrBA5+ewaIYUYXU2/LQ7+sK8fqiP8Py727g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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