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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85b2c54d97b5a0c98151298f6777004d171e16afe7a34130c3236f3d2b62b9ca' 
  AND token = 'Uxo2OGoAT5nkWaRZwdIMWqgZ8JsR7YdKU1JZaQgiv64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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